import java.util.*;
public class Example3_9 {
   public static void main (String args[]) {
     Scanner reader =new Scanner (System.in);
     double sum=0;
     int m=0;
     while(reader.hasNextDouble()) {
        double x = reader.nextDouble();
        m=m+1;
        sum=sum+x;
     }
     System.out.printf("%d个数的和为%f\n",m,sum);
     System.out.printf("%d个数的平均值是%f\n",m,sum/m);
   }
}

